Shell



FIG. 1 is a front, top and right side perspective view of a shell showing our new design;

FIG. 2 is a front elevational view of the shell;

FIG. 3 is a rear elevational view of the shell;

FIG. 4 is a top plan view of the shell;

FIG. 5 is a bottom plan view of the shell;

FIG. 6 is a left side elevational view of the shell; and,

FIG. 7 is a right side elevational view of the shell.

The broken lines shown represent the portions of the shell that form no part of the claimed design. 

CLAIM The ornamental design for a shell, as shown and described. 